OK, Embedded my vanillaform - but login doesn't work

I have a forum hosted on vanilla.com (http://skinadvice.vanillaforums.com/) and have used the embed addon as explained.
http://www.skinadvice.org/forum.asp
Looks cool, but when you login it simply returns to the "howdy stranger" as if the login cookie didnt hold or something.
Incidentally, if I open the vanilla forum hosted one and login there, then the embedded one works too. I sign out of the other window and gone.
Whats the solution there then?
http://www.skinadvice.org/forum.asp
Looks cool, but when you login it simply returns to the "howdy stranger" as if the login cookie didnt hold or something.
Incidentally, if I open the vanilla forum hosted one and login there, then the embedded one works too. I sign out of the other window and gone.
Whats the solution there then?
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Comments
Logging on using the vanillaforums.com (non embedded) version works on IE though?